Indicating device for heat treatment of metal.



H. B. ANDERSON.

INDICATING DEVICE FOR HEAT TREATMENT OF METAL.

' APPLICATION FILED APR.14, 1913.

19 1 34 Patented Jan.5,1915.

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Among the objects of this-invention are wer @FTQ.

HAROLD B. ATTIDERSON, 0F CLEVELAND, OHIO.

I/NDIC'ATING DEvIoE FOR HEAT TREATMENT 0 METAL.

To aZZ'wkom it may concern;-

' Be. it known that I, HAROLD B. ANDERSON,

, a citizen .of the UnitedStates, residing at has been discovered and the; fact is now Well known, that the strength, elasticity, permanence, toughness, hardness, and-other qualities of steel or other metals can be modified greatly by proper manipulation, one. of thelmost important manipulations being the maintaining of the metal parts at a predetermined degree of heat for a predetermined length of time, the temperature andduration of the treatmentdepending updn the metal and upon the'.results desired. These quantities, namely temperature and time, are different .for different metals, and even for different consignments of the same metaland areascertained by experts and engineers after a long and careful series of laboratory experiments.v The directions as totime and temperature formulated by themare communicated to the furnace men who are relied upon to carry out such directions. It ordinarily results, however, that a considerable percentage of the work is spoiled because the furnace men become confused as to the temperatures to be'main-- tained or forget or make mistakes-as to the time.

Heretofore the furnace man has been obliged either to rely upon his memory for the quantities, to jot down the same upon slips of paper which might become disarranged or lost, or to chalk up the quantities upon the wall near the furnace in which case his numbers frequently became confused with numbers previously placed the provision of a simple and convenient indicator having diflerent members which can be set to indicate the various quantities so as to avoid the danger of the workmans becoming confused as to the same; the provision of a simple and inexpensive construe- Specification of Letters Patent.

ment of the indicaton to the furnace.

Patented'Jan. 5,1915.

Application filed April 14, 1913. Serial lilo. 761,133.

.tion permitting the setting and secure holding of thejvariousindicators or pointers wlthoutthe possibility of moving any of the other pointers; while further objects and advantages of the-invention .will appear as the .description proceeds,

One of the constructions-in which my invention can be embodied isillustrated in the .drawings accompanying and forming a. part of this applicat on, wherein:

t Figure 1 represents, avportion of a furattached theretoyFig. 2 is a cross sectional view through; the indicating device taken substantially.- on the. line.22 of Fig-,1;

'nace having my improved indicating device and Fig. 3,is across sectional view'of the stud taken substantially on-the'line .3--3 ofFig. 2.

Describing the parts by reference. characters, l representsv a portion of. a furnace which may beef the usual or any desired type, and 2, a circularmetallicplate secured thereto in a' convenient and easily' visible location. Projecting forwardly from the center of the plate 2 is a stud 3, here shown as a shouldered member projected through an aperture in the plate and having threads 4 at its rearward end-receiving a nutv 5.

Between the nut and the rearward'side of the plate. 2 vthe arm'ti. of a bracket 7 is inserted, which bracket serves for the attja ch- 1voteduupona the stud-.3 are a plurality of pointers-,8, 9, 10, said pointers beingsep'arated by means of washers 11, each of which is. formedwith an internal projection or finger 12 engaging a slot 13 formed inthe side of the stud The re'armost pointer is spaced f'romthe face of the. plateby means ofia'z washer Mas shown in Fig. 2. The outer end of'the stud is threaded as at 15 for the receptionof a suitable thumb nut 16, an elastic metal spider 17 being located inside of the nut 16, so as to place a yielding tension upon the various pointers. A washer 11 is preferably interposed between the spider and the outermost pointer so that the turning of the pointer shall not tend" to rotate this spider and thereby change the adjustment of the nut 16.

The periphery of the plate 2 is provided with dial graduations as shown at 20in Fig. 2 running from 1 to 12 with suitable fractional indications so as to designate the hours and fractional hours of the day. Within the hour graduation scale is formed a temperature scale 21 covering all of the 7 range ordinarily employed in the heat treatment of metals, in the pi'esent"instance from 600 to 2400 F. In the present embodiment, I have illustrated the dial as formed with bot h, centigrade and. Fahrenheit scales so "as to be applicable for all installations. In

"color-of theimetal, I have illustrated'inside of the temperaturescale acolor scale denoted most installations some kind of direct read ing pyrometer is employed so that the workmen canq'egillatetlie heatof the" furnace in .telligently. lnlcase suchrefinem'ent is not employed and: the workman is left to 'deterininefithe proper temperature from the -at-'22, graduatingzt'he same approximately in accordance with 'therappearance of steel to thejaverage "man .at the .yarious' ,temper the hour scale and the thi r atures; o

Ih' the-embodiment 'here'shown one'lof the rpointers,'i as i 8', is "marked with the-- word upon the centigrade sealeand manipulates c his furnace .flto'b'i'ing git- 'to this-temperature.

Then, assuming tha-t he attains this uniform and stable temperature. and introduces his metal at 8 a'z m. he will a set the pointer marked In' atthejpoint 8 on -the honr'dial and will place the'pointer marked Out at'the point '1 on the hour dial; thereby in- -dicating that the material is, to be taken out at that time.-" It will then be'impossible :forhi'rn to raise the exclise offorgetf1ilness 'or confusion in case he fails 'to remove it at i the'proper time,"andifheshouldbe 'acei I dentally called away i-t would be possible for another'wdrkman to remove'tlie metal without specific instructions. The interposition'o f the washers-1111 between thedifferent pointers prenents the movement of one pointer .beingtr'ansmitted to the next,

while theelastic character of the 'spicler l7 'interpos'es ,a continuous pressure against the pointers which' permits their easy setting without allowing them to become disturbed While-I hate-described myinii'ention in connection with a heat-treatment "furnace "for metals',"it will be obvious that the same i can be used. for-manyother purposes," as in the extraction of 1ard'and'tall0w; the distilling of liqu0rs,fthe refiningof oils the manufacture of chemicals} theease hardenor" malleableizingflof iron and the like. Also. it. will be -QbV Q.S"-that th'aQjfi-figlfiflt pointe1=sma jbe distinguished by colors; and

that Qother scales- 'or'fften ipei atii ai'flbe employed depnninga upon 5 the? ope atioii's conducted; All of sueh iiiodifiqations {1 es:- teem within.thefscope f my'inyentiiie idea "ii I n a-nindicatoiffioruse i I r the heat treatment "of metahthe eombination,

with a metal platefof a rigid-stud carried by a 75 a" f'plui'alityf of superposed," independently reiiolii'ble p'ointerspivotedfiipon' "saidhnid washers between adjacent pointers-and having internal. "fingers engaging said grooire, a idineans secured to said stud {wa tress- 'ing said pointers and washers yieldiiigly to- 'gether, said-pointers; being; provided with indicia whereby theyj -may be Visually ,distinguish'edffom each other, and said plate being formed with dial grad iatioiis coop- .Intestimony whereof, I signature in the'presence' of two witnesses.

Witnesses: H v I HAROLD E. SMITH, Q NBRFNNAN B WEs'r.

HAJROLD B; ANDERSON; j. 

